Malicious PDF — malware analysis report

Static analysis result for SHA-256 53fb6ec7cda43ed3…

MALICIOUS

PDF

43.2 KB Created: 2020-06-19 22:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 135d03f1eef3484a1d9c4770a23cd870 SHA-1: cf8becdd85dad66735fcca42ff33b51c2dfe7714 SHA-256: 53fb6ec7cda43ed38f9aee81c875d7a84ce25315afaf61fdb4413d5af9718cfe
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or content distribution network. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of outbound links suggests a malicious intent to redirect users or host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://autodiscover.laindiscretafm.com/uploads/1/3/0/5/130546244/wemigabavov.pdf
    • http://apextherapeutics.net/uploads/1/3/0/6/130639514/remidepesasijarofuxa.pdf
    • http://empprinting.com/uploads/1/3/0/6/130620560/1363087.pdf
    • http://hostmaster.citrap-ge.ch/uploads/1/3/1/6/131637409/fewib-felipejisog-dobomilibora-wuvifegot.pdf
    • http://aricaalp.com/uploads/1/3/0/4/130489172/cd321f6aaa15a30.pdf
    • http://cpcalendars.benchmarkbeefmasters.co.za/uploads/1/3/2/6/132695719/namidiw.pdf
    • http://riinabodyart.com/uploads/1/3/1/3/131398197/6009056.pdf
    • http://general1948.com/uploads/1/3/1/3/131383383/1453577.pdf
    • http://earlyipf.com/uploads/1/3/1/8/131856611/265da1e333.pdf
    • http://mx.elgaby.com/uploads/1/3/1/6/131636707/f2496bb978.pdf
    • http://hostmaster.wmdodgearchery.co.uk/uploads/1/3/0/8/130813490/jivok_jojusupakogenet.pdf
    • http://vsnofug.sites.looka.com/uploads/1/3/1/8/131856381/131856381.html#la+literatura+nazi+en+america+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006975.bin
5941ed43a22e4d6a8a345689f239d10c3ff4932d4cbca6cdb23dc1e20608d37a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6975 4884 bytes
font_01_sfnt_off000079f7.bin
efd3aa51337b9724a1c6d5cb2b2f70eb0640363790a015f5d5467a8c1817825a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79F7 11308 bytes

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